All the survivors from the godless nations that fought against Jerusalem will travel to Jerusalem every year to worship the King, God-of-the-Angel-Armies, and celebrate the Feast of Booths.
If any of these survivors fail to make the annual pilgrimage to Jerusalem to worship the King, God-of-the-Angel-Armies, there will be no rain.
If the Egyptians don't make the pilgrimage and worship, there will be no rain for them. Every nation that does not go up to celebrate the Feast of Booths will be hit with the plague.
Egypt and any other nation that does not make pilgrimage to celebrate the Feast of Booths gets punished.
On that Day, the Big Day, all the horses' harness bells will be inscribed "Holy to God." The cooking pots in the Temple of God will be as sacred as chalices and plates on the altar.
In fact, all the pots and pans in all the kitchens of Jerusalem and Judah will be holy to God-of-the-Angel-Armies. People who come to worship, preparing meals and sacrifices, will use them. On that Big Day there will be no buying or selling in the Temple of God-of-the-Angel-Armies.